Air-pump.



PATENTED DEC. 10, 1907.,

G. H. MOHLER.

AIR PUMP.

APPLICATION FILED NOV. 24,1908.

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GEORGE E. MOHLER, OF FREMONT, NEBRASKA.

AIR-PUMP.

Specification of Letters Patent.

Patented Dec. 10,1907.-

Application filed November 2 1906- Serial No. 3445 841.

To all whom it may concern:

Be it known that GEORGE H. MOHLER, a citizen of the United States, residing at Fremont, in the county of Dodge and-State of Nebraska, has invented certain new and useful Improvements in Air-Pumps, of which the following is a specification.

This invention relates to improvements in air pumps of the class designed principally for use in colleges and class rooms and has reference to mechanism for compression {of air and also for quickly forming a vacuum.

The invention has for one of its objects the presentation of a valve considered novel and effective for the purposes designed, and to certain new features of construction found convenient.

With these and other objects in view the invention presents a novel construction and arrangement of parts as described herein, pointed out by the claims, and illustrated by the drawing, wherein,

Figure 1 represents a side elevation of an air pump embodying the invention. Fig. 2 is an end view, with parts broken away and broken lines, to indicate certain parts. Fig. 3 is a partly broken figure, and indicates a sectional view through the center of the pump to show valve-housing and ports. Fig. 4 is a partly broken figure to clearly show valve-housing and ports, being a transverse sectional view to that shown in Fig. 3. Figs. 5 and 6 are plan views of the cone valve, to clearly show formation of angular recessed passage-ways. Fig. 7 is a detail in section relating to said valve. Fig. 8 is a View of the valve-shaft and its coupling, partly in section. Fig. 9 is a detail relating to Fig. 8.

, Fig. 10 is an end view of the valve and Fig.

11 is a View of an expansion ring.

Referring now to the drawing, the numeral 1 indicates a table having a base 2 and legs 3, 3 and 4. Secured upon the lower surface of the table 1, near one of its ends is hanger 5 and near its center is hanger 6, and upon these hangers in suitable bearings is seated shaft 7 having seated thereon the operating wheel 8. Upon the center of base 2 is secured a suitable platform, upon which is secured the base of air pump 10 having a vertical cylinder-wall 10 and having an en larged lower portion 11 which furnishes a transverse seating forvalve 12, presently to be more particularly described. Upon the lower surfaceof table 1 are secured, in any convenient manner, the curved arms 13 which at their lower ends are formed as parallel arms 14 and extended downwardly on the plane of the pump, and terminate in the apertured head or guide 15 for piston-rod 16 which slides within this apertured head, and prevents undue vibration, and insures a vertical stroke of the piston-rod.

For the purpose of actuating the pistonrod, the inner end of shaft 7 is extended beyond hanger 6 to furnish a rigid seating for crank-arm 17; upon end 18 of this crankarm is pivotally seated the head 19 of pitman 20; the end 21 of the pitman has a pivotal seating upon head 22, the latter being keyed to the plunger or piston-rod 16, and as thus described the parts are common to pumps of this class, and by revolving the opcrating-wheel completely, in either direction plunger 16 will pass vertically within and outwardly from the cylinder of pump 10 only once, as is apparent. Crank-arm 17 has an opposite extension 23 (Fig. 2.), useful in a measure, for preventing an uneven or jarring movement of the mounting at 18, of the pitman head.

In order'that the cone-valve 12 may have a rotation in either direction in its housin 11 I employ a vertical shaft 24 disposed transverse to but upon the same vertical plane as shaft 7; the upper end of shaft 24 has a convenient pivotal seating within the lower end of hanger 5, the lower end of this shaft having a similar seating in the strut 25, secured to base 2, and I employ the valveshaft 26, disposed horizontally and suitably sustained within the spherical housing 27; and by employing the miter gears 28 and 29 respectively upon the horizontal shafts and the vertical shaft, it is apparent that valve 12 may be rotated under operation of wheel 8. The sphere 27 is employed in the manner shown so that clothing of the operator or others may not come in mesh with the gear, also to furnish a support for the coupling of shaft 26.

Reference to Figs. 5, 6 and 7 will show that the circular valve 12 is elongated and is uniformly tapered as indicated at e c, (Fig. 5.) from its base to its opposite end and it therefore presents ,a surface well adapted for the formation of passage ways, presently to bedescribed. This valve is seated within a close-fitting aperture A, which is convergingly formed, as indicated at d d, (Fig. 3.)

and therefore corresponds to the conical form" of the valve, said aperture passing through" the metal of housing 11 in a direction transverse to the wall 10 of pump 10. There are four escape-ways connected with aperture A, as passages 30 and 31 (Fig. 3.) these escapeways being adjacent and extending upward, upon the central plane of aperture A through the valve-housing, to the interior chamber 32 of pump 10; the other two escape-ways are indicated at 33 and 34 (Fig. 4.) and extend from aperture A horizontally through housing 11 and communicate with pipes 33 and 34 (Figs. 2 and 4.); and while said escapeways 33 and 34 pass from opposite sides of aperture A, they are not formed on the same vertical plane. With reference to the circular aperture A, therefore, passage-ways 30 or 31 are located 90 degrees from passage-ways 33 and 34, and the distance between passageways 33 and 34 is 180 degrees.

Four recesses or escape-ways 35, 36, 37 and 38 (Figs. 5 and 6.) are formed transversely upon valve 12, and when this valve is seated in housing 11, the escape-ways 35 and 36 of the valve are in alinement, respectively, with escape-ways 30 and 31; and escapeways 37 and 38 of the valve are in alinement, respectively, with escape-ways 33 and 34 of the valve-housing, and when valve 12 is rotated each of its recesses will pass and will communicate with the respective escapeways with which it corresponds, leading to chamber 32 or to pipes 33 or 34, as is evident. It will be noted that the adjacent ends of recesses 35 and 37 are connected by a short transverse recess a, and that the adj acent ends of recesses 38 and 36 are also connected by the short transverse recess 1), best shown in Fig. 5; all other parts of the surface of cone-valve 12, not occupied by the recesses mentioned, remain a blank.

In order to exhaust air from or to compress air within a receptacle by use of the rotatable cone valve 12 having these recesses, it is clear that the valve must have a fixed relative rotation with reference to the vertical movements of the piston of the pump. Now, cone-valve 12 has this fixed relative movement during its rotation with reference to the movement of the piston, and this relative movement is regulated by devices now to be explained.

A recess 40 (Figs. 7 and 10.) is formed in the base of valve 12. A spiral spring 41 is seated in this recess and, preferably, a rubber block 42 is seated upon the outer end of this spring. A collar 43 is formed upon the wrist 44, the latter having bearings in the wall of sphere 27. Valve-shaft 26 is provided with side lugs 45 and 46 upon its ends; collar 43 is provided with groove 47 (Fig. 8.) adapted to receive side-lug 46; recess 40 is provided with groove 48 (Fig. 10.) adapted to receive side-lug 45 of the shaft. On account of spring 41 (Fig. 7.), shaft 26, therefore causes exactness of contact of the tapered valve in its housing and this shaft may be readily detached or placed in operative position, the latter being accomplished by first adjusting the shaft to the valve by pushing one of the ends of said shaft against spring 41, after which the opposite end is placed to its seating in collar 43, each lug being within its respective groove.

When the handle of-the operating Wheel 8 is at its lowest position, as shown in Fig. 1, piston 39 has reached its lowest position in the wall of pump 10; ahalf revolution of the operating wheel causes a complete upward stroke of piston-rod 16, valve 12 by this movement havingperformed a half revolution. At the time the piston is in the position shown in Figs. 1 and 3, cone-valve 12 has an upper face presentation substantially as shown in Fig. 5, at which time the end 0 approaches, during rotation of the valve, escape-way 31, and, as piston 39 at this time is performing an upward movement, air is drawn upward from recess 36, and since recess 38, during the balance of this half-rotation, has communication with escape-way 33 and intake pipe 33, it is plain, that air will be drawn into. chamber 32 of the pump during said half-rotation, the supply therefor being air which passes inwardly through said pipe 33. Intake pipe 33 leads to hell jar 50 (Fig. 2.), the air from the latter being exhausted and passing into chamber 32 of pump 10. During the half-revolution of valve 12, as mentioned, while piston 39 is passing upward, the other recesses on the valve face the curved and blank wall of aperture A of the valve-housing and do not encounter any escape-ways. Upon turning the operating wheel to complete the revolution, the movement of piston 39 will be downward. At the time the piston commences this downward movement the conevalve will have an upper face presentation substantially as shown in Fig. 6, and recess 35 at this time will be presented to escapeway 30, and by operation of the pump, air from chamber 32 will be forced downward through escape-way 30 and will pass into recess 35, with which escape-way 30 communicates; and since recess 37 is in alinement with escape-way 34, air will be forced outwardly through exit-pipe 34. Exit pipe 34 leads to the receiver 51 and by thus turning the operating wheel, a practical vacuum may be created within the bell jar, the air therefrom passing through the pump and by it forced into the receiver. During the halfrevolution of valve 12, while the piston is moving downward, recesses 35 and 37 alone are operative, since the other recesses (36 and 38) of the valve make a face presentation to the blank wall of aperture A and do not, during that half-revolution, make communication with escape Ways. 1

An exact closure is required of piston 39 equally well for obtaining results by this rewith the cylindrical wall within which it is seated, and I have found it to be of advantage to construct a piston by using two cylinder-blocks 52 and 53 and to interpose therebetween layers of leather 5 1 and 55 with oppositely-extending, upset edges pressed outwardly as by springs 56, the latter being seated in annular grooves 57 formed in the peripheries of the cylinder-blocks, which press the upset portions of the leather outwardly to a firm contact; a layer of oil 58 is employed upon the upper surface of the piston. As matter of convenience for detaching or assembling the parts, plunger 16 is formed with a tapering lower end which has a threaded connection with parts of the cylinder-blocks.

It has been the aim of applicant, in the present instance, to secure for the use of the class room, an air pump of a high degree of efficiency, and having'the fewest number of parts possible; in order to efiect a compact construction, the vertical shaft has been em ployed, and the intake and exit pipes have been inclosed in a manner to avoid the usual accumulation of pipes and mechanism beneath the table. Intake pipe 33 after being extended beneath base 2, is extended upward within leg 3 of the table in a manner to communicate with bell jar 50, and is provided with a downwardly extended portion, as duct 59 connected with pipe 33 at one end and centrally of the table, and provided with cock 60. Exit pipe 3 1 after being extended downward through base 2 passes upward within leg 3, the legs of the table being constructed hollow for this purpose; this exit pipe is then extended horizontally beneath the rail or crown of the table and is then extended downward a convenient distance to support thereon the receiver 51, this downward extension being provided with cook 61, the receiver 51 being itself provided with cock 62. WVith this arran ement, air may be exhausted from the be jar and compressed within the receiver.

' By reversing rotation of the operating wheel, the cone valve will, of course, receive a reverse rotation, and recesses 35, 36, 37 and 38 will perform a reverse function to that already described, and air will be forced reversely through pipes 33 and 3' 1, and this is a desired object; the invention operates verse rotation; and by employing the reverse rotation of the operating wheel, the receiver may be utilized as a vacuum receptacle, and. other instructive variations may be introduced by reason of this reverse action.

What I claim as my invention is,

1. In mechanism as described, the combination with an exhaust receptacle, a condensing-receptacle, a valve-housing, a suitable frame; a cone-shaped valve seated in said valve-housing and having two recesses formed therein and provided with a lengthwise-extending shaft axially mounted therepipe communicating with said exhaust-re-,

ceptacle and one of the recesses of said cone shaped valve, and an exit-pipe communicating with the condensing-receptacle and the other of said recesses of the cone-shaped valve; the rotatable movement of the driving shaft adapted, simultaneously, to cause a longitudinal movement of the piston of the air-pump and rotary movement of said coneshaped valve to exhaust air from the exhaust-receptacle and to force air within the condensing-receptacle.

2. In mechanism as described, the combination with an exhaust-receptacle, a con (lensing-receptacle, a valve housing and a suitable frame; a valve seated in said valve housing and having two recesses formed therein and provided with a horizontally disposed shaft mounted thereon; a rotatable driving shaft mounted in suitable bearings upon the frame and provided with a crankarm and a gear thereon; a vertical shaft in suitable bearings upon the frame and having a rotatable connection with the gear upon the driving shaft and extended to a rotatable connection with the horizontally disposed shaft of said valve; downwardly-extending piston guide-arms secured up on the frame; an air pump in communication with the recesses of said valve and having a piston contactingly traversingsaid guide-arms to a connection with said crank-arm of the driving shaft; an intake-pipe communicating with said exhaust receptacle and one of therecesses of said valve, and an exit-pipe communicating with the condensing-receptacle and the other of said recesses of said valve; thev rotatable movement of the driving shaft adapted, simultaneously, to cause a longitudinal movement of the piston of the air pump and rotary movement of said valve to exhaust air from the exhaust-receptacle and to force air within the condensing-receptacle. In testimony whereof he has aflixed his signature in presence of two witnesses.

GEORGE H. MOHLER. Witnesses:

ARTHUR STURGES, HIRAM A. STURGES. 

